[LoongArch][RISCV] Fix incorrect indexing of incoming byval arguments in tail call eligibility check (#188006) The loop that validates byval arguments in `isEligibleForTailCallOptimization()` incorrectly used the loop index `i` when accessing `getIncomingByValArgs()`, even though `j` is the index tracking the number of encountered byval arguments. This mismatch could lead to out-of-bounds access or incorrect type comparisons when non-byval arguments are interleaved with byval arguments, causing the tail call eligibility check to fail or behave incorrectly. Fix this by using `j` consistently as the index into the incoming byval argument list and only incrementing it after the bounds check. This issue affects both LoongArch and RISCV backends, which share the same logic pattern. Fixes #187832
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